Tohutoro APA (7th ed.)

Beard, C. A. (1961). The presidents in american history. Julian Messner.

Tohutoru Kātū Chicago (17th ed.)

Beard, Charles A. The Presidents in American History. Nueva York: Julian Messner, 1961.

Tohutoro MLA (9th ed.)

Beard, Charles A. The Presidents in American History. Julian Messner, 1961.